No we don't to my knowledge have twins in our line.
but out of maybe vague interest, there were Durkins in York in 1862 who had twins. John and Bridgets twins, michael and Patrick died aged 1 day old.
We got the information about counties from the church records initially. The catholic marriage record from 1853 gave the residence of bride and grooms parents at the time of marriage, this was Sligo for the groom and Mayo for the bride. We have only seen this info on the 51 census quite recently, but it does not appear on any later ones, they just say Ireland.
However the other pair came over already married so I don't think we will ever really know where they came from, not for sure. The most likely option is of course around Mayo, Roscommon, Sligo.
Where occupation is given for our lot its either general or agricultural labourer, or for the children - hawker!
Windy